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Product description
An upgrade option for cartridge wheel bearings that offer extremely low friction, improved power transfer, and a service life that far exceeds traditional steel bearings.
- Includes 4 X 61903 + 2 X 61803 bearings
- Fits NSW (NOT DISC) Before mid 2018 (1st gen)
- Grade 3 Silicon Nitride balls
- Hardened races
- Reinforced polyamide cage and non-contact seals
- Hand built in Denmark
- High resistance to poor lubrication
